MC78T15ABT

ON Semiconductor
MC78T00 Series 3.0 A Positive Voltage Regulators This family of fixed voltage regulators are monolithic integrated circuits capable of driving loads in excess of 3.0 A. These three–terminal regulators employ internal current limiting, thermal shutdown, and safe–area compensation. Devices are available with improved specifications, including a 2% output voltage tolerance, on AC–suffix 5.0, 12 and 15 V device types. Although designed primarily as a fixed voltage regulator, these devices can be used with external components to obtain adjustable voltages and currents. This series of devices can be used with a series–pass transistor to supply up to 15 A at the nominal output voltage. • Output Current in Excess of 3.0 A • Power Dissipation: 25 W • No External Components Required • Output Voltage Offered in 2% and 4% Tolerance* • Thermal Regulation is Specified • Internal Thermal Overload Protection • Internal Short Circuit Current Limiting • Output Transistor Safe–Area Compensation THREE–AMPERE POSITIVE FIXED VOLTAGE REGULATORS SEMICONDUCTOR TECHNICAL DATA T SUFFIX PLASTIC PACKAGE CASE 221A Pin 1. Input 2. Ground 3. Output 1 2 3 Heatsink surface is connected to Pin 2. DEVICE TYPE/NOMINAL OUTPUT VOLTAGE MC78T05 MC78T08 5.0 V 8.0 V MC78T12 MC78T15 12 V 15 V ORDERING INFORMATION Simplified Application Input Cin* 0.33µF MC78TXX Operating Temperature Package Range Device VO Tol. MC78TXXCT MC78TXXACT 4% 2%* TJ = 0° to +125°C Plastic Power MC78TXXBT# MC78TXXABT# 4% 2%* TJ = –40° to +125°C Plastic Power XX Indicates nominal voltage. Output * 2% regulators available in 5, 12 and 15 V devices. # Automotive temperature range selections are available with special test conditions and additional tests. Contact your local ON Semiconductor sales office for information. CO** A common ground is required between the input and the output voltages. The input voltage must remain typically 2.2 V above the output voltage even during the low point on the input ripple voltage. XX these two digits of the type number indicate voltage. ** Cin is required if regulator is located an appreciable distance from power supply filter. ** (See Applications Information for details.) ** CO is not needed for stability; however, it does improve transient response.  Semiconductor Components Industries, LLC, 2002 January, 2002 – Rev. 3 1 Publication Order Number: MC78T00/D MC78T00 Series MAXIMUM RATINGS (TA = +25°C, unless otherwise noted.) Symbol Value Unit VI 35 40 Vdc Power Dissipation and Thermal Characteristics Plastic Package (Note 1) TA = +25°C Thermal Resistance, Junction–to–Air TC = +25°C Thermal Resistance, Junction–to–Case PD RθJA PD RθJC Internally Limited 65 Internally Limited 2.5 Storage Junction Temperature Tstg +150 °C Operating Junction Temperature Range (MC78T00C, AC) TJ 0 to +125 °C Rating Input Voltage (5.0 V – 12 V) Input Voltage (15 V) °C/W °C/W NOTES: 1. Although power dissipation is internally limited, specifications apply only for PO ≤ Pmax, Pmax = 25 W. ELECTRICAL CHARACTERISTICS (Vin = 10 V, IO = 3.0 A, 0°C ≤ TJ ≤ 125°C, PO ≤ Pmax [Note 1], unless otherwise noted.) MC78T05AC Characteristics Output Voltage (5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C) (5.0 mA ≤ IO ≤ 3.0 A; 5.0 mA ≤ IO ≤ 2.0 A, 7.3 Vdc ≤ Vin ≤ 20 Vdc) Symbol Min Typ Max Min Typ Max 4.9 4.8 5.0 5.0 5.1 5.2 4.8 4.75 5.0 5.0 5.2 5.25 – 3.0 25 – 3.0 25 – – 10 15 30 80 – – 10 15 30 80 – 0.001 0.01 – 0.002 0.03 – – 3.5 4.0 5.0 6.0 – – 3.5 4.0 5.0 6.0 VO Line Regulation (Note 2) (7.2 Vdc ≤ Vin ≤ 35 Vdc, IO = 5.0 mA, TJ = +25°C; 7.2 Vdc ≤ Vin ≤ 35 Vdc, IO = 1.0 A, TJ = +25°C; 8.0 Vdc ≤ Vin ≤ 12 Vdc, IO = 3.0 A, TJ = +25°C; 7.5 Vdc ≤ Vin ≤ 20 Vdc, IO = 1.0 A) Regline Load Regulation (Note 2) (5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C) (5.0 mA ≤ IO ≤ 3.0 A) Regload Thermal Regulation (Pulse = 10 ms, P = 20 W, TA = +25°C) Regtherm Quiescent Current (5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C) (5.0 mA ≤ IO ≤ 3.0 A) MC78T05C Unit Vdc mV mV IB %VO/W mA Quiescent Current Change (7.2 Vdc ≤ Vin ≤ 35 Vdc, IO = 5.0 mA, TJ = +25°C; 5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C; 7.5 Vdc ≤ Vin ≤ 20 Vdc, IO = 1.0 A) ∆IB – 0.3 1.0 – 0.3 1.0 mA Ripple Rejection (8.0 Vdc ≤ Vin ≤ 18 Vdc, f = 120 Hz, IO = 2.0 A, TJ = 25°C) RR 62 75 – 62 75 – dB Vin–VO – 2.2 2.5 – 2.2 2.5 Vdc Output Noise Voltage (10 Hz ≤ f ≤ 100 kHz, TJ = +25°C) Vn – 10 – – 10 – µV/VO Output Resistance (f = 1.0 kHz) RO – 2.0 – – 20 – mΩ Short Circuit Current Limit (Vin = 35 Vdc, TJ = +25°C) ISC – 1.5 – – 1.5 – A Peak Output Current (TJ = +25°C) Imax – 5.0 – – 5.0 – A TCVO – 0.2 – – 0.2 – mV/°C Dropout Voltage (IO = 3.0 A, TJ = +25°C) Average Temperature Coefficient of Output Voltage (IO = 5.0 mA) NOTES: 1. Although power dissipation is internally limited, specifications apply only for PO ≤ Pmax, Pmax = 25 W. 2. Line and load regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. http://onsemi.com 2 MC78T00 Series ELECTRICAL CHARACTERISTICS (Vin = 13 V, IO = 3.0 A, 0°C ≤ TJ ≤ 125°C, PO ≤ Pmax [Note 1], unless otherwise noted.) MC78T08C Characteristics Symbol Output Voltage (5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C) (5.0 mA ≤ IO ≤ 3.0 A; 5.0 mA ≤ IO ≤ 2.0 A, 10.4 Vdc ≤ Vin ≤ 23 Vdc) Min Typ Max 7.7 7.6 8.0 8.0 8.3 8.4 – 4.0 35 – – 10 15 30 80 – 0.002 0.03 – – 3.5 4.0 5.0 6.0 VO Line Regulation (Note 2) (10.3 Vdc ≤ Vin ≤ 35 Vdc, IO = 5.0 mA, TJ = +25°C 10.3 Vdc ≤ Vin ≤ 35 Vdc, IO = 1.0 A, TJ = +25°C 11 Vdc ≤ Vin ≤ 17 Vdc, IO = 3.0 A, TJ = +25°C 10.7 Vdc ≤ Vin ≤ 23 Vdc, IO = 1.0 A) Regline Load Regulation (Note 2) (5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C) (5.0 mA ≤ IO ≤ 3.0 A) Regload Thermal Regulation (Pulse = 10 ms, P = 20 W, TA = +25°C) Regtherm Quiescent Current (5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C) (5.0 mA ≤ IO ≤ 3.0 A) Unit Vdc mV mV IB %VO/W mA Quiescent Current Change (10.3 Vdc ≤ Vin ≤ 35 Vdc, IO = 5.0 mA, TJ = +25°C; 5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C; 10.7 Vdc ≤ Vin ≤ 23 Vdc, IO = 1.0 A) ∆IB – 0.3 1.0 mA Ripple Rejection (11 Vdc ≤ Vin ≤ 21 Vdc, f = 120 Hz, IO = 2.0 A, TJ = 25°C) RR 60 71 – dB Vin–VO – 2.2 2.5 Vdc Vn – 10 – µV/VO Output Resistance (f = 1.0 kHz) RO – 2.0 – mΩ Short Circuit Current Limit (Vin = 35 Vdc, TJ = +25°C) ISC – 1.5 – A Peak Output Current (TJ = +25°C) Imax – 5.0 – A TCVO – 0.3 – mV/°C Dropout Voltage (IO = 3.0 A, TJ = +25°C) Output Noise Voltage (10 Hz ≤ f ≤ 100 kHz, TJ = +25°C) Average Temperature Coefficient of Output Voltage (IO = 5.0 mA) NOTES: 1. Although power dissipation is internally limited, specifications apply only for PO ≤ Pmax, Pmax = 25 W. 2. Line and load regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. http://onsemi.com 3 MC78T00 Series ELECTRICAL CHARACTERISTICS (Vin = 17 V, IO = 3.0 A, 0°C ≤ TJ ≤ 125°C, PO ≤ Pmax [Note 1], unless otherwise noted.) MC78T12AC Characteristics Output Voltage (5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C) (5.0 mA ≤ IO ≤ 3.0 A, 5.0 mA ≤ IO ≤ 2.0 A, 14.5 Vdc ≤ Vin ≤ 27 Vdc) Symbol Typ Max Min Typ Max 11.75 11.5 12 12 12.25 12.5 11.5 11.4 12 12 12.5 12.6 – 6.0 45 – 6.0 45 – – 10 15 30 80 – – 10 15 30 80 – 0.001 0.01 – 0.002 0.03 – – 3.5 4.0 5.0 6.0 – – 3.5 4.0 5.0 6.0 VO Line Regulation (Note 2) (14.5 Vdc ≤ Vin ≤ 35 Vdc, IO = 5.0 mA, TJ = +25°C; 14.5 Vdc ≤ Vin ≤ 35 Vdc, IO = 1.0 A, TJ = +25°C; 16 Vdc ≤ Vin ≤ 22 Vdc, IO = 3.0 A, TJ = +25°C; 14.9 Vdc ≤ Vin ≤ 27 Vdc, IO = 1.0 A) Regline Load Regulation (Note 2) (5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C) (5.0 mA ≤ IO ≤ 3.0 A) Regload Thermal Regulation (Pulse = 10 ms, P = 20 W, TA = +25°C) Regtherm Quiescent Current (5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C) (5.0 mA ≤ IO ≤ 3.0 A) MC78T12C Min Unit Vdc mV mV IB %VO/W mA Quiescent Current Change (14.5 Vdc ≤ Vin ≤ 35 Vdc, IO = 5.0 mA, TJ = +25°C; 5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C; 14.9 Vdc ≤ Vin ≤ 27 Vdc, IO = 1.0 A) ∆IB – 0.3 1.0 – 0.3 1.0 mA Ripple Rejection (15 Vdc ≤ Vin ≤ 25 Vdc, f = 120 Hz, IO = 2.0 A, TJ = 25°C) RR 57 67 – 57 67 – dB Dropout Voltage (IO = 3.0 A, TJ = +25°C) Vin – VO – 2.2 2.5 – 2.2 2.5 Vdc Output Noise Voltage (10 Hz ≤ f ≤ 100 kHz, TJ = +25°C) Vn – 10 – – 10 – µV/VO Output Resistance (f = 1.0 kHz) RO – 2.0 – – 20 – mΩ Short Circuit Current Limit (Vin = 35 Vdc, TJ = +25°C) ISC – 1.5 – – 1.5 – A Peak Output Current (TJ = +25°C) Imax – 5.0 – – 5.0 – A Average Temperature Coefficient of Output Voltage (IO = 5.0 mA) TCVO – 0.5 – – 0.5 – mV/°C NOTES: 1. Although power dissipation is internally limited, specifications apply only for PO ≤ Pmax, Pmax = 25 W. 2. Line and load regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. http://onsemi.com 4 MC78T00 Series ELECTRICAL CHARACTERISTICS (Vin = 20 V, IO = 3.0 A, 0°C ≤ TJ ≤ 125°C, PO ≤ Pmax [Note 1], unless otherwise noted.) MC78T15AC Characteristics Output Voltage (5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C) (5.0 mA ≤ IO ≤ 3.0 A; 5.0 mA ≤ IO ≤ 2.0 A, 17.5 Vdc ≤ Vin ≤ 30 Vdc) Symbol MC78T15C Min Typ Max Min Typ Max 14.7 14.4 15 15 15.3 15.6 14.4 14.25 15 15 15.6 15.75 – 7.5 55 – 7.5 55 – – 10 15 30 80 – – 10 15 30 80 – 0.001 0.01 – 0.002 0.03 – – 3.5 4.0 5.0 6.0 – – 3.5 4.0 5.0 6.0 VO Line Regulation (Note 2) (17.6 Vdc ≤ Vin ≤ 40 Vdc, IO = 5.0 mA, TJ = +25°C; 17.6 Vdc ≤ Vin ≤ 40 Vdc, IO = 1.0 A, TJ = +25°C; 20 Vdc ≤ Vin ≤ 26 Vdc, IO = 3.0 A, TJ = +25°C; 18 Vdc ≤ Vin ≤ 30 Vdc, IO = 1.0 A) Regline Load Regulation (Note 2) (5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C) (5.0 mA ≤ IO ≤ 3.0 A) Regload Thermal Regulation (Pulse = 10 ms, P = 20 W, TA = +25°C) Regtherm Unit Vdc mV mV %VO/W Quiescent Current (5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C) (5.0 mA ≤ IO ≤ 3.0 A) IB mA Quiescent Current Change (17.6 Vdc ≤ Vin ≤ 40 Vdc, IO = 5.0 mA, TJ = +25°C; 5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C; 18 Vdc ≤ Vin ≤ 30 Vdc, IO = 1.0 A) ∆IB – 0.3 1.0 – 0.3 1.0 mA Ripple Rejection (18.5 Vdc ≤ Vin ≤ 28.5 Vdc, f = 120 Hz, IO = 2.0 A, TJ = 25°C) RR 55 65 – 55 65 – dB Dropout Voltage (IO = 3.0 A, TJ = +25°C) Vin–VO – 2.2 2.5 – 2.2 2.5 Vdc Output Noise Voltage (10 Hz ≤ f ≤ 100 kHz, TJ = +25°C) Vn – 10 – – 10 – µV/VO Output Resistance (f = 1.0 kHz) RO – 2.0 – – 20 – mΩ Short Circuit Current Limit (Vin = 40 Vdc, TJ = +25°C) ISC – 1.0 – – 1.0 – A Peak Output Current (TJ = +25°C) Imax – 5.0 – – 5.0 – A TCVO – 0.6 – – 0.6 – mV/°C Average Temperature Coefficient of Output Voltage (IO = 5.0 mA) NOTES: 1. Although power dissipation is internally limited, specifications apply only for PO ≤ Pmax, Pmax = 25 W. 2. Line and load regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. http://onsemi.com 5 MC78T00 Series The performance of a voltage regulator is specified by its immunity to changes in load, input voltage, power dissipation, and temperature. Line and load regulation are tested with a pulse of short duration (< 100µs) and are strictly a function of electrical gain. However, pulse widths of longer duration (> 1.0 ms) are sufficient to affect temperature gradients across the die. These temperature gradients can cause a change in the output voltage, in addition to changes caused by line and load regulation. Longer pulse widths and thermal gradients make it desirable to specify thermal regulation. Thermal regulation is defined as the change in output voltage caused by a change in dissipated power for a specified time, and is expressed as a percentage output voltage change per watt. The change in dissipated power can be caused by a change in either the input voltage or the load current. Thermal regulation is a function of IC layout and die attach techniques, and usually occurs within 10 ms of a change in power dissipation. After 10 ms, additional changes in the output voltage are due to the temperature coefficient of the device. Figure 1 shows the line and thermal regulation response of a typical MC78T05AC to a 20 W input pulse. The variation of the output voltage due to line regulation is labeled ➀ and the thermal regulation component is labeled ➁. Figure 2 shows the load and thermal regulation response of a typical MC78T05AC to a 20 W load pulse. The output voltage variation due to load regulation is labeled ➀ and the thermal regulation component is labeled ➁. ∆ V O , OUTPUT V in , INPUT VOLTAGE DEVIATION (V) VOLTAGE (V) ∆ V O , OUTPUT VOLTAGE DEVIATION (V) VOLTAGE REGULATOR PERFORMANCE 2 1 8.0 I O , OUTPUT CURRENT (A) (2.0 mV/DIV) 18 2 1 2 2.0 0 t, TIME (2.0 ms/DIV) Vout = 5.0 V Vin = 8.0 V → 18 V → 8.0 V Iout = 2.0 A t, TIME (2.0 ms/DIV) Vout = 5.0 V Vin = 15 Iout = 0 A → 2.0 A → 0 A 1 = Regline = 2.4 mV 2 = Regtherm = 0.0015%VO/W Figure 1. MC78T05AC Line and Thermal Regulation Q1 1.0k (2.0 mV/DIV) 2 1 = Regline = 4.4 mV 2 = Regtherm = 0.0015%VO/W Figure 2. MC78T05AC Load and Thermal Regulation Input 1.0k Q2 Q20 Q22 6.7V 210 Q21 16k Q8 300 Q3 Q4 Q24 Q9 3.6k 6.4k Q5 200 1.0k 3.0k Q19 5.6k 10pF Q23 50 520 Q12 Q6 Q7 2.6k 8.0-15VO 5.0 VO 3.9k 2.0k Q11 Q25 Q26 13 200 Q27 0.12 Output 40 pF 6.0k Q17 Q18 Q15 Q13 6.0k 300 Q16 Q10 100 Q14 Gnd 2.8k Representative Schematic Diagram http://onsemi.com 6 MC78T00 Series 100 r O , OUTPUT IMPEDANCE (Ω ) NORMALIZED OUTPUT VOLTAGE 1.02 Vin - Vout = 10 V Iout = 100 mA 1.0 .98 -90 -50 -10 30 70 110 TJ, JUNCTION TEMPERATURE (°C) 150 10-1 10-2 10-3 10-4 1.0 190 Figure 3. Temperature Stability RR, RIPPLE REJECTION (dB) Iout = 50 mA 80 Iout = 1.5 A 60 Vout = 5.0 V Vin = 10 V CO = 0 TJ = 25°C 40 4.0 10 100 1.0 k 10 k 100 k 1.0 M 10 M 1.0 k 10 k 100 k f, FREQUENCY (Hz) 1.0 M 10 M 100 M 40 Vout = 5.0 V Vin = 10 V CO = 0 f = 120 Hz TJ = 25°C 0.1 1.0 10 Iout, OUTPUT CURRENT (A) Figure 5. Ripple Rejection versus Frequency Figure 6. Ripple Rejection versus Output Current 5.0 TJ = 25°C 3.0 TJ = 125°C 2.0 TJ = 0°C TJ = 25°C TJ = 125°C 0 60 f, FREQUENCY (Hz) TJ = 0°C 1.0 80 30 0.01 100 M IB , QUIESCENT CURRENT (mA) RR, RIPPLE REJECTION (dB) 100 100 20 1.0 IB , QUIESCENT CURRENT (mA) 10 Figure 4. Output Impedance 100 0 Vout = 5.0 V Vin = 7.5 V Iout = 1.0 A CO = 0 TJ = 25°C 10 20 30 TJ = 25°C 3.0 TJ = 125°C 2.0 1.0 0 0.01 40 TJ = 0°C 4.0 Vin-Vout = 5.0 V 0.1 1.0 Vin, INPUT VOLTAGE (Vdc) Iout, OUTPUT CURRENT (A) Figure 7. Quiescent Current versus Input Voltage Figure 8. Quiescent Current versus Output Current http://onsemi.com 7 10 MC78T00 Series Iout = 3.0 A 2.0 Iout = 1.0 A 1.5 Iout = 0.5 A 1.0 ∆VO = 50 mV -50 -10 30 70 110 150 4.0 2.0 TJ = 0°C TJ = 25°C TJ = 125°C 0 10 20 30 TJ, JUNCTION TEMPERATURE (°C) Vin-VO, INPUT-OUTPUT VOLTAGE (Vdc) Figure 9. Dropout Voltage Figure 10. Peak Output Current 0.8 Vout = 5.0 V Iout = 150 mA CO = 0 TJ = 25°C 0.6 0.4 0.2 40 0.3 Vin = 10 V CO = 0 TJ = 25°C 0.2 0.1 0 -0.1 0 -0.2 -0.3 -0.2 -0.4 -0.6 1.0 0.5 0 6.0 0 190 I out , OUTPUT ∆ V out , OUTPUT VOLTAGE DEVIATION (V) CURRENT (A) ∆ V out , OUTPUT VOLTAGE DEVIATION (V) 0.5 -90 ∆ Vin , INPUT VOLTAGE CHANGE (V) I max, PEAK OUTPUT CURRENT (A) 8.0 0 10 20 30 40 1.5 1.0 0.5 0 0 10 20 30 t, TIME (µs) t, TIME (µs) Figure 11. Line Transient Response Figure 12. Load Transient Response P D(AV) , MAXIMUM AVERAGE POWER DISSIPATION (W) V in -Vout , INPUT TO OUTPUT VOLTAGE DIFFERENTIAL (Vdc) 2.5 40 30 20 Maximum Ambient Temperature θSA of Heatsinks 1.3°C/W 2.4°C/W Infinite Heatsink 3.3°C/W 10 6.3°C/W 10.5°C 0 25 50 75 100 TA, AMBIENT TEMPERATURE (°C) Figure 13. Maximum Average Power Dissipation for MC78T00CT, ACT http://onsemi.com 8 125 40 MC78T00 Series APPLICATIONS INFORMATION Design Considerations regulator is connected to the power supply filter with long wire lengths, or if the output load capacitance is large. An input bypass capacitor should be selected to provide good high frequency characteristics to insure stable operation under all load conditions. A 0.33 µF or larger tantalum, mylar, or other capacitor having low internal impedance at high frequencies should be chosen. The bypass capacitor should be mounted with the shortest possible leads directly across the regulator’s input terminals. Normally good construction techniques should be used to minimize ground loops and lead resistance drops since the regulator has no external sense lead. The MC78T00 Series of fixed voltage regulators are designed with Thermal Overload Protection that shuts down the circuit when subjected to an excessive power overload condition, Internal Short Circuit Protection that limits the maximum current the circuit will pass, and Output Transistor Safe–Area Compensation that reduces the output short circuit current as the voltage across the pass transistor is increased. In many low current applications, compensation capacitors are not required. However, it is recommended that the regulator input be bypassed with a capacitor if the MC78T05 Input Input R 0.33µF Constant Current to Grounded Load 7 IO The MC78T05 regulator can also be used as a current source when connected as above. In order to minimize dissipation the MC78T05 is chosen in this application. Resistor R determines the current as follows: 5.0 V IO = R + IB 0.33µF + 4 2 0.1µF 3 10k MC1741 VO, 8.0 V to 20 V Vin - VO ≥ 2.5 V The addition of an operational amplifier allows adjustment to higher or intermediate values while retaining regulation characteristics. The minimum voltage obtainable with this arrangement is 3.0 V greater than the regulator voltage. Figure 14. Current Regulator Figure 15. Adjustable Output Regulator Input 2N4398 or Equiv MC78TXX 1.0µF 6 1.0k ∆IB
0.7 mA over line, load and Temperature changes IB
3.5 mA For example, a 2.0 A current source would require R to be a 2.5 Ω, 10W resistor and the output voltage compliance would be the input voltage less 7.0 V. R Output MC78T05 Output Rsc R 2N4398 or Equiv. MJ2955 or Equiv. MC78TXX 1.0µF 0.1µF Output XX = 2 digits of type number indicating voltage. The MC78T00 series can be current boosted with a PNP transistor. The 2N4398 provides current to 15 A. Resistor R in conjunction with the VBE of the PNP determines when the pass transistor begins conducting; this circuit is not short circuit proof. Input-output differential voltage minimum is increased by the VBE of the pass transistor. XX = 2 digits of type number indicating voltage. The circuit of Figure 17 can be modified to provide supply protection against short circuits by adding a short circuit sense resistor, RSC, and an additional PNP transistor. The current sensing PNP must be able to handle the short circuit current of the three-terminal regulator. Therefore, an eight-ampere power transistor is specified. Figure 16. Current Boost Regulator Figure 17. Current Boost With Short Circuit Protection http://onsemi.com 9 MC78T00 Series PACKAGE DIMENSIONS T SUFFIX PLASTIC PACKAGE CASE 221A–09 ISSUE AA –T– B SEATING PLANE C F T S 4 DIM A B C D F G H J K L N Q R S T U V Z A Q 1 2 3 U H K Z L R V NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION Z DEFINES A ZONE WHERE ALL BODY AND LEAD IRREGULARITIES ARE ALLOWED. J G D N http://onsemi.com 10 INCHES MIN MAX 0.570 0.620 0.380 0.405 0.160 0.190 0.025 0.035 0.142 0.147 0.095 0.105 0.110 0.155 0.018 0.025 0.500 0.562 0.045 0.060 0.190 0.210 0.100 0.120 0.080 0.110 0.045 0.055 0.235 0.255 0.000 0.050 0.045 ----0.080 MILLIMETERS MIN MAX 14.48 15.75 9.66 10.28 4.07 4.82 0.64 0.88 3.61 3.73 2.42 2.66 2.80 3.93 0.46 0.64 12.70 14.27 1.15 1.52 4.83 5.33 2.54 3.04 2.04 2.79 1.15 1.39 5.97 6.47 0.00 1.27 1.15 ----2.04 MC78T00 Series Notes http://onsemi.com 11 MC78T00 Series ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. PUBLICATION ORDERING INFORMATION Literature Fulfillment: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303–675–2175 or 800–344–3860 Toll Free USA/Canada Fax: 303–675–2176 or 800–344–3867 Toll Free USA/Canada Email: ONlit@hibbertco.com JAPAN: ON Semiconductor, Japan Customer Focus Center 4–32–1 Nishi–Gotanda, Shinagawa–ku, Tokyo, Japan 141–0031 Phone: 81–3–5740–2700 Email: r14525@onsemi.com ON Semiconductor Website: http://onsemi.com For additional information, please contact your local Sales Representative. N. American Technical Support: 800–282–9855 Toll Free USA/Canada http://onsemi.com 12 MC78T00/D